ER303-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The ER303-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 300V DC reverse voltage and 3A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity. The ER303-TP operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.25 @ 3 A	V
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 300 V
Capacitance @ Vr, F	35	pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the ER303-TP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Voltage Rating: Reverse voltage must equal 300V DC maximum
Current Rating: Average rectified current must equal 3A
Forward Voltage Drop: Maximum forward voltage at rated current must equal 1.25V @ 3A
Recovery Characteristics: Reverse recovery time must equal 35ns; speed classification must match Fast Recovery ≤ 500ns, > 200mA
Leakage Current: Reverse leakage current specification at rated reverse voltage
Package Type: DO-201AD axial through-hole package required for mechanical and thermal compatibility
Operating Temperature Range: Junction temperature range must span -55°C to 150°C minimum
Compliance: RoHS3 compliance required

The substitute part ER303_R2_00001 manufactured by Panjit International Inc. meets all these criteria and is classified as an active product, providing design continuity for the obsolete ER303-TP.

Parameter Comparison

Parameter	ER303-TP (Micro Commercial Co)	ER303_R2_00001 (Panjit International Inc.)	Match Status
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 3 A	1.25 V @ 3 A	Equivalent
Reverse Recovery Time (trr)	35 ns	35 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 300 V	1 µA @ 300 V	Compatible (Lower leakage)
Capacitance @ Vr, F	35 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz	Equivalent
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Equivalent
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
Technology	Standard	Standard	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The ER303_R2_00001 manufactured by Panjit International Inc. is the qualified substitute for the obsolete ER303-TP. Selection is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including reverse voltage rating (300V), forward current capacity (3A), forward voltage drop (1.25V @ 3A), and reverse recovery time (35ns). The reverse leakage current of ER303_R2_00001 (1 µA @ 300V) is lower than the original specification (5 µA @ 300V), representing improved performance within acceptable limits.

Mechanical Compatibility: Both parts use identical DO-201AD axial through-hole packaging, ensuring direct mechanical and thermal compatibility in existing PCB layouts without modification.

Compliance Status: ER303_R2_00001 maintains ROHS3 compliance and includes REACH Unaffected status, meeting current regulatory requirements. The original ER303-TP is ROHS3 compliant.

Product Availability: ER303_R2_00001 is classified as an active product with current manufacturing support, ensuring long-term availability and supply chain continuity compared to the obsolete ER303-TP.

Packaging Consideration: ER303_R2_00001 is supplied in Tape & Reel (TR) format, which may differ from the original packaging. Verify packaging compatibility with assembly processes if component handling specifications are critical.

Frequently Asked Questions (FAQ)

Q: Can ER303_R2_00001 be used as a direct replacement for ER303-TP in existing designs?

A: Yes. ER303_R2_00001 meets all electrical and mechanical specifications of ER303-TP. Both parts have identical voltage ratings (300V), current ratings (3A), forward voltage characteristics (1.25V @ 3A), recovery time (35ns), and package type (DO-201AD axial). Direct substitution is electrically and mechanically compatible.

Q: What is the difference in reverse leakage current between the two parts?

A: ER303-TP specifies 5 µA @ 300V reverse leakage, while ER303_R2_00001 specifies 1 µA @ 300V. The lower leakage current of the substitute part represents improved performance and does not create compatibility issues in circuit applications.

Q: Does the packaging format difference affect circuit board assembly?

A: ER303_R2_00001 is supplied in Tape & Reel (TR) format, while ER303-TP packaging format is not specified in the provided data. Tape & Reel packaging is standard for automated assembly processes. Verify that your assembly equipment and processes are compatible with TR packaging if component handling specifications are critical to your production workflow.

Q: Are both parts RoHS compliant?

A: Yes. Both ER303-TP and ER303_R2_00001 are ROHS3 compliant. ER303_R2_00001 additionally carries REACH Unaffected status, confirming compliance with current environmental and regulatory standards.

Q: Why is ER303-TP classified as obsolete?

A: ER303-TP is listed as obsolete, indicating that Micro Commercial Co has discontinued manufacturing. ER303_R2_00001 from Panjit International Inc. is an active product with current manufacturing support, providing design continuity and supply chain stability.

Q: What is the operating temperature range for both parts?

A: Both ER303-TP and ER303_R2_00001 operate across a junction temperature range of -55°C to 150°C, ensuring equivalent thermal performance in applications across industrial, commercial, and consumer temperature environments.

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